High 7.5Published Oct 9, 2026

CVE-2026-62367Vikunja: OIDC email-fallback account linking ignores email_verified, enabling local-account takeover

Updated under an hour ago (2026-10-19 08:50 UTC)

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EPSS puts the chance of exploitation in the next 30 days at 0.09%, higher than 0% of scored CVEs.

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Every CVE for go-vikunja vikunja

Exploited in the last 30 days

Vikunja is an open-source self-hosted task management platform. In versions 1.0.0 through 2.3.0, when an administrator enables the per-provider `emailfallback` option on an OpenID Connect provider, Vikunja links an SSO login to a pre-existing local (username+password) account using only the `email` claim from the IdP. The fallback never checks an `email_verified` (or Microsoft `xms_edov`) signal and never requires the matched account's password. An attacker who can obtain a token from the configured issuer carrying a victim's email logs in as that victim with a full session, with no consent or interaction from the victim. Version 2.4.0 fixes the issue.

CVSS: 7.5 HIGH (v4.0, CNA)CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness (CWE): CWE-287, CWE-290, CWE-345
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.09% (percentile 0)
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Oct 13, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

go-vikunja vikunja go_vikunja:vikunja (from the name)	from 1.0.0, < 2.4.0	CNA record

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xv7q-fvmc-jx96x-refsource-confirm
https://github.com/go-vikunja/vikunja/commit/7854f2729ab72000210b61c25929678fd6901630x-refsource-misc
https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.